Calculator
What the Blur Image does
Blur Image: applies a Gaussian blur with the browser's canvas filter (with a resampling fallback for older browsers). Everything runs in your browser and the file is never uploaded.
Drop in a file and the Blur Image handles it locally. The work happens inside your browser tab, so there is no upload to wait for and no queue.
It is mostly used by anyone shrinking a photo before uploading it. Oversized images are the most common reason a page feels slow.
There is no account, no upload and no server round trip, because the page does the work itself.
Each field is explained further down, along with the method and a worked example that uses the default values.
What do the Blur Image fields mean?
The Blur Image uses 4 inputs. The starting figures are ordinary, not edge cases, so they make a sensible baseline.
| Field | What to enter | Default |
|---|---|---|
| Image file | stays on your device | none |
| Blur radius | measured in px; accepts 1 to 100 | 8 |
| Export as | choose from PNG, JPEG or WebP | PNG |
| Quality % | accepts 10 to 100 | 92 |
How does the Blur Image work?
Each output is derived from the inputs above in a single pass; there is no hidden state carried between runs, so the same inputs always give the same calculation.
Bad input produces a message, not a silently incorrect figure.
What a typical run looks like
You provide: Image file, Blur radius, Export as and Quality %
What happens: the file is read into memory by your browser, processed locally, and offered back as a download. It is never uploaded.
You get back: a new file plus a brief account of what happened to it, shown in the panel.
How long this takes is a property of your computer, not of our infrastructure, and file size is bounded by browser memory.
How to use it
- Choose your file under Image file, or drag it onto the drop area.
- Put Blur radius in px (1 to 100).
- Pick a value for Export as: the options are PNG, JPEG or WebP.
- Fill in Quality % (10 to 100).
- Press Blur.
- Check Status on the right.
- If you need a record, Copy Link saves the inputs and Print produces a clean page.
What this tool does not do
- Re-encoding a lossy format such as JPEG always loses some detail, even at maximum quality.
- EXIF metadata may be dropped during processing, which is usually desirable but worth knowing.
- There is no history: reload the page and the previous run is gone.
- The result inherits any error in the inputs without flagging it.
- Large files are limited by your available memory, not by an upload quota.
Frequently asked questions
Enter Blur radius in px. Every input names its unit, and every output does too, which removes the usual source of error.
Blur radius accepts 1 to 100 px. Go outside it and you get an error against that specific field instead of a misleading number.
No upload takes place. The file is handled entirely in the browser and discarded when you close the tab.
No cost and no account. Use it as often as you like.
As accurate as the inputs allow. The arithmetic itself introduces no error beyond display rounding.